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                    接口封装和代码整理
            
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                    实验指导一
            
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                    什么是中断
            
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                    RISC-V 中的中断
            
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                    程序运行状态
            
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                    时钟中断
            
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                    实验指导二
            
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                    摘要
            
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                    动态内存分配
            
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                    物理内存探测
            
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                    从虚拟地址到物理地址
            
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                    页面置换*
            
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                    小结
            
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                    实验指导四
            
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                    摘要
            
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                    线程和进程
            
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                    线程的结束
            
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                    内核栈
            
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                    线程调度
            
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                    实验指导五
            
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                    驱动和块设备驱动
            
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                    文件系统
            
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                    小结
            
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                    实验指导六
            
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                    摘要
            
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                    构建用户程序框架
            
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                    打包为磁盘镜像
            
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                    解析 ELF 文件并创建线程
            
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                    条件变量
            
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                    小结
            
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                    实验一：中断
            
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                    实验二：内存分配
            
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                    实验三：虚实地址转换
            
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                    实验四（上）：线程
            
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                    实验六：系统调用
            
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<p>&#x6211;&#x4EEC;&#x7684;&#x5B9E;&#x9A8C;&#x9898;&#x4F1A;&#x63D0;&#x4F9B;&#x4E00;&#x4E2A;&#x57FA;&#x7840;&#x7684;&#x4EE3;&#x7801;&#x6846;&#x67B6;&#xFF0C;&#x4EE5;&#x4FBF;&#x4E8E;&#x8FDB;&#x884C;&#x5B9E;&#x9A8C;&#x3002;&#x5982;&#x679C;&#x4F60;&#x9009;&#x62E9;&#x53C2;&#x8003;&#x6559;&#x7A0B;&#xFF0C;&#x81EA;&#x5DF1;&#x7F16;&#x5199;&#x64CD;&#x4F5C;&#x7CFB;&#x7EDF;&#xFF0C;&#x8FD9;&#x4E2A;&#x4EE3;&#x7801;&#x6846;&#x67B6;&#x4E5F;&#x53EF;&#x4EE5;&#x7528;&#x6765;&#x8FDB;&#x884C;&#x5BF9;&#x7167;&#x3002;</p>
</blockquote>
<h3 id="&#x5B9E;&#x9A8C;&#x9898;">&#x5B9E;&#x9A8C;&#x9898;</h3>
<!--
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<ol>
<li><p>&#x539F;&#x7406;&#xFF1A;&#x5728; <code>rust_main</code> &#x51FD;&#x6570;&#x4E2D;&#xFF0C;&#x6267;&#x884C; <code>ebreak</code> &#x547D;&#x4EE4;&#x540E;&#x81F3;&#x51FD;&#x6570;&#x7ED3;&#x675F;&#x524D;&#xFF0C;<code>sp</code> &#x5BC4;&#x5B58;&#x5668;&#x7684;&#x503C;&#x662F;&#x600E;&#x6837;&#x53D8;&#x5316;&#x7684;&#xFF1F;</p>
<div class="click_reveal"><span> Click to show </span><div><blockquote>
<ul>
<li><p><code>sp</code> &#x9996;&#x5148;&#x51CF;&#x53BB;&#x4E00;&#x4E2A; <code>Context</code> &#x7684;&#x5927;&#x5C0F;&#xFF08;&#x5165;&#x6808;&#xFF09;&#xFF0C;&#x7136;&#x540E;&#x539F; <code>sp</code> &#x7684;&#x503C;&#x88AB;&#x4FDD;&#x5B58;&#x5230;&#x8FD9;&#x4E2A;&#x5165;&#x6808;&#x7684; <code>Context</code> &#x4E2D;&#x3002;</p>
</li>
<li><p>&#x6267;&#x884C; <code>handle_interrupt</code> &#x7684;&#x8FC7;&#x7A0B;&#x4E2D;&#xFF0C;&#x968F;&#x7740;&#x5C40;&#x90E8;&#x53D8;&#x91CF;&#x7684;&#x4F7F;&#x7528;&#xFF0C;&#x7F16;&#x8BD1;&#x5668;&#x53EF;&#x80FD;&#x4F1A;&#x81EA;&#x52A8;&#x52A0;&#x5165;&#x4E00;&#x4E9B;&#x51FA;&#x5165;&#x6808;&#x64CD;&#x4F5C;&#x3002;&#x4F46;&#x65E0;&#x8BBA;&#x5982;&#x4F55;&#xFF0C;<code>handle_interrupt</code> &#x524D;&#x540E; <code>sp</code> &#x7684;&#x503C;&#x662F;&#x4E00;&#x6837;&#x7684;&#x3002;</p>
</li>
<li><p>&#x4ECE; <code>handle_interrupt</code> &#x8FD4;&#x56DE;&#x540E;&#xFF0C;&#x6267;&#x884C; <code>__restore</code>&#xFF0C;&#x5728;&#x6700;&#x540E;&#x5C06;&#x4FDD;&#x5B58;&#x7684;&#x539F; <code>sp</code> &#x503C;&#x6062;&#x590D;&#x3002;</p>
</li>
</ul>
</blockquote>
</div></div>

<p><br></p>
</li>
<li><p>&#x5206;&#x6790;&#xFF1A;&#x5982;&#x679C;&#x53BB;&#x6389; <code>rust_main</code> &#x540E;&#x7684; <code>panic</code> &#x4F1A;&#x53D1;&#x751F;&#x4EC0;&#x4E48;&#xFF0C;&#x4E3A;&#x4EC0;&#x4E48;&#xFF1F;</p>
<div class="click_reveal"><span> Click to show </span><div><blockquote>
<p><code>rust_main</code> &#x8FD4;&#x56DE;&#x540E;&#xFF0C;&#x7A0B;&#x5E8F;&#x5E76;&#x6CA1;&#x6709;&#x505C;&#x6B62;&#x3002;<code>rust_main</code> &#x662F;&#x5728; <code>entry.asm</code> &#x4E2D;&#x901A;&#x8FC7; <code>jal</code> &#x6307;&#x4EE4;&#x8C03;&#x7528;&#x7684;&#xFF0C;&#x56E0;&#x6B64;&#x5176;&#x6267;&#x884C;&#x5B8C;&#x540E;&#x4F1A;&#x56DE;&#x5230; <code>entry.asm</code> &#x4E2D;&#x3002;&#x4F46;&#x662F;&#xFF0C;<code>entry.asm</code> &#x5E76;&#x6CA1;&#x6709;&#x5728;&#x540E;&#x9762;&#x5199;&#x4EFB;&#x4F55;&#x6307;&#x4EE4;&#xFF0C;&#x8FD9;&#x610F;&#x5473;&#x7740;&#x7A0B;&#x5E8F;&#x5C06;&#x63A5;&#x7740;&#x5411;&#x540E;&#x6267;&#x884C;&#x5185;&#x5B58;&#x4E2D;&#x7684;&#x4EFB;&#x4F55;&#x6307;&#x4EE4;&#x3002;</p>
<p>&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x901A;&#x8FC7; <code>rust-objdump -d -S os/target/riscv64imac-unknown-none-elf/debug/os | less</code> &#x6765;&#x67E5;&#x770B;&#x6C47;&#x7F16;&#x4EE3;&#x7801;&#xFF0C;&#x5176;&#x4E2D;&#x5C31;&#x80FD;&#x770B;&#x5230;&#xFF1A;<code>_start</code> &#x53EA;&#x6709;&#x77ED;&#x77ED;&#x4E09;&#x6761;&#x6307;&#x4EE4;&#xFF0C;&#x800C;&#x540E;&#x9762;&#x5219;&#x653E;&#x7740;&#x8BB8;&#x591A; Rust &#x5E93;&#x4E2D;&#x7684;&#x51FD;&#x6570;&#x3002;&#x8FD9;&#x4E9B;&#x6307;&#x4EE4;&#x53EF;&#x80FD;&#x5BFC;&#x81F4;&#x7A0B;&#x5E8F;&#x8FDB;&#x5165;&#x5FAA;&#x73AF;&#xFF0C;&#x6216;&#x5D29;&#x6E83;&#x9000;&#x51FA;&#x3002;</p>
</blockquote>
</div></div>

<p><br></p>
</li>
<li><p>&#x5B9E;&#x9A8C;</p>
<ol>
<li><p>&#x5982;&#x679C;&#x7A0B;&#x5E8F;&#x8BBF;&#x95EE;&#x4E0D;&#x5B58;&#x5728;&#x7684;&#x5730;&#x5740;&#xFF0C;&#x4F1A;&#x5F97;&#x5230; <code>Exception::LoadFault</code>&#x3002;&#x6A21;&#x4EFF;&#x6355;&#x83B7; <code>ebreak</code> &#x548C;&#x65F6;&#x949F;&#x4E2D;&#x65AD;&#x7684;&#x65B9;&#x6CD5;&#xFF0C;&#x6355;&#x83B7; <code>LoadFault</code>&#xFF08;&#x4E4B;&#x540E; <code>panic</code> &#x5373;&#x53EF;&#xFF09;&#x3002;</p>
<div class="click_reveal"><span> Click to show </span><div><blockquote>
<p>&#x76F4;&#x63A5;&#x5728; <code>match</code> &#x4E2D;&#x6DFB;&#x52A0;&#x4E00;&#x4E2A; arm &#x5373;&#x53EF;&#x3002;&#x4F8B;&#x5982; <code>Trap::Exception(Exception::LoadFault) =&gt; panic!()</code></p>
</blockquote>
</div></div>

<p><br></p>
</li>
<li><p>&#x5728;&#x5904;&#x7406;&#x5F02;&#x5E38;&#x7684;&#x8FC7;&#x7A0B;&#x4E2D;&#xFF0C;&#x5982;&#x679C;&#x7A0B;&#x5E8F;&#x60F3;&#x8981;&#x975E;&#x6CD5;&#x8BBF;&#x95EE;&#x7684;&#x5730;&#x5740;&#x662F; <code>0x0</code>&#xFF0C;&#x5219;&#x6253;&#x5370; <code>SUCCESS!</code>&#x3002;</p>
<div class="click_reveal"><span> Click to show </span><div><blockquote>
<p>&#x5982;&#x679C;&#x7A0B;&#x5E8F;&#x56E0;&#x65E0;&#x6548;&#x8BBF;&#x95EE;&#x5185;&#x5B58;&#x9020;&#x6210;&#x5F02;&#x5E38;&#xFF0C;&#x8FD9;&#x4E2A;&#x8BBF;&#x95EE;&#x7684;&#x5730;&#x5740;&#x4F1A;&#x88AB;&#x5B58;&#x653E;&#x5728; <code>stval</code> &#x4E2D;&#xFF0C;&#x800C;&#x5B83;&#x5DF2;&#x7ECF;&#x88AB;&#x6211;&#x4EEC;&#x4F5C;&#x4E3A;&#x53C2;&#x6570;&#x4F20;&#x5165; <code>handle_interrupt</code> &#x4E86;&#xFF0C;&#x56E0;&#x6B64;&#x76F4;&#x63A5;&#x5224;&#x65AD;&#x5373;&#x53EF;</p>
</blockquote>
</div></div>

<p><br></p>
</li>
<li><p>&#x6DFB;&#x52A0;&#x6216;&#x4FEE;&#x6539;&#x5C11;&#x91CF;&#x4EE3;&#x7801;&#xFF0C;&#x4F7F;&#x5F97;&#x8FD0;&#x884C;&#x65F6;&#x89E6;&#x53D1;&#x8FD9;&#x4E2A;&#x5F02;&#x5E38;&#xFF0C;&#x5E76;&#x4E14;&#x6253;&#x5370;&#x51FA; <code>SUCCESS!</code>&#x3002;</p>
<ul>
<li>&#x8981;&#x6C42;&#xFF1A;&#x4E0D;&#x5141;&#x8BB8;&#x6DFB;&#x52A0;&#x6216;&#x4FEE;&#x6539;&#x4EFB;&#x4F55; unsafe &#x4EE3;&#x7801;</li>
</ul>
<p><br></p>
<div class="click_reveal"><span> Click to show </span><div><blockquote>
<ul>
<li>&#x89E3;&#x6CD5; 1&#xFF1A;&#x5728; <code>interrupt/handler.rs</code> &#x7684; <code>breakpoint</code> &#x51FD;&#x6570;&#x4E2D;&#xFF0C;&#x5C06; <code>context.sepc += 2</code> &#x4FEE;&#x6539;&#x4E3A; <code>context.sepc = 0</code>&#xFF08;&#x5219; <code>sret</code> &#x65F6;&#x7A0B;&#x5E8F;&#x4F1A;&#x8DF3;&#x8F6C;&#x5230; <code>0x0</code>&#xFF09;</li>
<li>&#x89E3;&#x6CD5; 2&#xFF1A;&#x53BB;&#x9664; <code>rust_main</code> &#x4E2D;&#x7684; <code>panic</code> &#x8BED;&#x53E5;&#xFF0C;&#x5E76;&#x5728; <code>entry.asm</code> &#x7684; <code>jal rust_main</code> &#x4E4B;&#x540E;&#xFF0C;&#x6DFB;&#x52A0;&#x4E00;&#x884C;&#x8BFB;&#x53D6; <code>0x0</code> &#x5730;&#x5740;&#x7684;&#x6307;&#x4EE4;&#xFF08;&#x4F8B;&#x5982; <code>jr x0</code> &#x6216; <code>ld x1, (x0)</code>&#xFF09;</li>
</ul>
</blockquote>
</div></div>

</li>
</ol>
</li>
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